Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
hanh tranh » canh tranh, hanh trinh, hanh trang
hoc thiet » hoc thieu, hoc thuyet, hoc hien
tranh cua » doanh cua, manh cua
bang cong » dang cong, bang song, dung cong
hang cong » dang cong, hang nong, thanh cong
manh toan » thanh toan, anh tuan

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - hanh tranh cua ((bang cong) OR (hang cong)) ((manh toan) OR (tinh toan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet tach - hanh tranh cua ((bang cong) or (hang cong)) ((manh toan) OR (tinh toan)) cau~".
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - hanh tranh cua ((bang cong) or (hang cong)) ((manh toan) OR (tinh toan)) cau*.